EVS 918:2016

Petroleum and liquid petroleum products. Measurement of content of storage tanks by manual methods and calculation of measurement uncertainty

General information
Valid from 03.02.2016
Directives or regulations
Standard history
This standard gives guidance for calculating standard volume and mass of petroleum and liquid petroleum products (hereinafter liquids), stored in a tanks under atmospheric pressure. This standard describes calculations for the determination of volume and mass of the liquids and the required measurements: — manual dip measurement of liquid stored in tanks with or without a floating roof; — manual cut dip measurement of free water; — manual measurement of the storage tank’s reference height; — manual measurement of the liquid’s temperature; — calculation of standard volume and mass of the liquid; — evaluation of measurement uncertainty of volume and mass of the liquid. This standard is applicable under the following conditions: — density of the liquid shall be from 611,16 kg/m3 to 1163,86 kg/m3; — temperature of the liquid during measurements shall be between -25 °C and +100 °C; — smallest measurable height of the liquid shall not be less than 500 mm; — storage tank’s capacity table shall be made according to the requirements of applicable standard EVS-ISO 7507-1, EVS-ISO 12917-1 or EVS-ISO 12917-2; — tilt of the storage tank shall not exceed 3 %; — the difference of densities of the liquid stored in the tank and the reference density of the capacity table shall not exceed ±30 %. NOTE This standard does not address the safety reguirements.
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